Impact of the Galactic template on the solar dipole ring-gain measurements, for one detector at 143  GHz. We compare the results obtained using the HFI temperature maps at each frequency (from, e.g., previous reconstructions). For this plot, ring-by-ring gains have been smoothed with a width of 50 rings (which corresponds to about 2 days). The largest variations occur for rings for which the solar dipole amplitude is low relative to the Galactic emission (around days 50, 200, 400, 550, and 700). Using the HFI map at the detector’s frequency as a Galactic template minimizes the systematic ring-to-ring variations.